JP2019127986A - Pulley device, and pulley body replacement method - Google Patents

Abstract

To provide a pulley device for an elevator, in which a pulley body replacement work can be performed from one axial side of a pulley device installed in the machine room or the like of an elevator, and in which adjustment work of a pulley core is easily performed.SOLUTION: The pulley device is provided which is installed between two beams and in which a pulley core is arranged so that the direction thereof matches with the sheave core of a hoisting machine. The pulley device comprises: a first bracket fitted to one beam; a second bracket fitted to the other beam; a rotary shaft installed between both brackets; and a pulley body freely rotatably supported by the rotary shaft via a bearing. The first bracket holds one end of the rotary shaft so as not to rotate, the second bracket holds the other end of the rotary shaft detachably, and the rotary shaft has a thicker step than the other part between the first bracket and the pulley body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pulley apparatus installed in a machine room or the like of an elevator, and a method of replacing the pulley body of the pulley apparatus.

  First, a pulley apparatus used for an elevator apparatus will be outlined using FIGS. 6 and 7.

  FIG. 6 is a perspective view outlining the overall configuration of the elevator apparatus, and shows the elevator apparatus provided with the machine room 100 in the upper part of the hoistway 101 where the car 104 moves up and down. The machine room 100 is provided with a hoisting machine 106 and a pulley device 1, and a main rope 107 is wound around the sheave 106 a of the hoisting machine 106 and the pulley body 1 a of the pulley device 1. A car 104 is attached to one end of the main rope 107, and a counterweight 105 is attached to the other end, so that the car 104 and the counterweight 105 are suspended by a 1: 1 roping method. Then, by appropriately controlling the rotation of the sheave 106a of the hoisting machine 106, the main rope 107 can be wound up by a desired amount, and the car 104 can be moved up and down to a desired position. In the hoistway 101, a pair of car side guide rails 103 for guiding the raising and lowering of the car 104 and a pair of balance weight side guide rails 102 for guiding the raising and lowering of the balance weight 105 are installed. The car 104 and the counterweight 105 can be lifted and lowered stably.

  FIG. 7 is a top view of the machine room 100. As shown here, a hoisting mechanism for the main rope 107 including the hoisting machine 106 and the pulley device 1 is installed near the wall on the back side when viewed from the entrance 100a of the machine room 100, and a predetermined distance is provided. A governor 108 and a control panel 109 are also installed. This hoisting mechanism is configured by arranging the hoisting machine 106 and the pulley device 1 so that the rotational axes of the sheave 106a and the pulley main body 1a are parallel to each other, and more specifically, the sheave of the sheave 106a. The sheave 106a and the pulley main body 1a are arranged between the beams 9a and 9b so that the directions of the core and the pulley core of the pulley main body 1a coincide.

  As a conventional example of an elevator pulley used here, the one described in Patent Document 1 is known. 1 and the like of the same document includes a shaft having a step at the center in the axial direction, a pulley body 1a supported by the shaft via a bearing, and a bearing retainer provided outside the pulley body 1a. The pulley is described.

JP-A-61-223369

  An example of a conventional pulley apparatus such as Patent Document 1 will be described with reference to FIG. 9 which is a vertical sectional view thereof. As shown here, the pulley main body 1a is provided with a main rope groove around which the main rope 107 is wound, and two bearings 2 are coaxially press-fitted at the center of both surfaces of the pulley main body 1a. In order to prevent the bearings 2 from coming off, bearing retainers 31 are fixed to both surfaces of the pulley body 1a by bearing retainer fixing bolts 32. A rotary shaft 3 is inserted into the bearing 2, and the pulley body 1 a rotates around the rotary shaft 3. Further, a step portion 3a having a large diameter is provided at the central portion in the axial direction of the rotating shaft 3, and the bearing 2 is fixed in position and the pulley body 1a is prevented from moving in the axial direction. At both ends of the rotary shaft 3, a key plate 7 is fitted in the key groove of the rotary shaft 3 to prevent the rotary shaft 3 from coming off the brackets 5a and 5b and the rotary shaft 3 itself from rotating. The plate 7 is fixed to the brackets 5a and 5b by a key plate fixing bolt 8. The brackets 5a and 5b are fixed to the beams 9a and 9b by bracket fastening bolts 10a and 10b, respectively, and the beams 9a and 9b are installed on the floor of the machine room 100 through other structures. With such a configuration, the load applied by the main rope 107 to the pulley body 1a can be supported by the floor of the machine room 100 via the bearing 2, the rotary shaft 3, the brackets 5a and 5b, and the beams 9a and 9b. The pair of left and right beams 9a and 9b may be integrally configured, and the bracket 5a and the beam 9a, and the bracket 5b and the beam 9b may be integrally configured.

  As illustrated in FIG. 7, the machine room 100 often has a minimum size enough to install the hoisting machine 106, the governor 108, the control panel 109 and the like, so a sufficient working space in the machine room 100 can be obtained. It can not often be secured. The pulley apparatus 1 of FIG. 9 has a configuration in which the pulley body 1a, the bearing 2, and the rotary shaft 3 are integrated by providing the step portion 3a of the rotary shaft 3 and the bearing retainer 31, and therefore wear or the like. Even if only the pulley main body 1a is to be replaced due to the above, the three parties are removed together, disassembled, and then only the pulley main body 1a is replaced. It is necessary to attach the pulley body 1a and the like to the hoisting mechanism. When removing or attaching the rotary shaft 3 from the brackets 5a and 5b, it is necessary to work on both the bracket 5a side and the bracket 5b side, so the hoisting mechanism is installed near the wall as shown in FIG. In such a case, there is a problem that work in a narrow space on the beam 9b side also occurs, and the burden on the worker is large.

  In addition, after replacement of the pulley main body 1a, as shown in FIG. 8, it is necessary to adjust the arrangement of the pulley main body 1a so that the direction of the sheave core of the sheave 106a and the direction of the pulley core of the pulley main body 1a coincide. . This adjustment work needs to be performed with the pulley body 1a attached to the brackets 5a and 5b. However, in the configuration shown in FIG. 9, there is a mechanism for adjusting the position of the pulley body 1a after being attached to the brackets 5a and 5b. Therefore, there is a problem that it is difficult to adjust the direction of the sheave core and the pulley core.

  In order to solve the above problems, a pulley apparatus according to the present invention is provided between two beams, and a pulley core is arranged so that the direction coincides with a sheave core of a hoisting machine, and one beam is provided. A first bracket attached to the other beam, a second bracket attached to the other beam, a rotating shaft installed between both brackets, and a pulley body rotatably supported by the rotating shaft via a bearing, The first bracket holds one end of the rotating shaft so as not to rotate, the second bracket holds the other end of the rotating shaft detachably, and the rotating shaft is The first bracket and the pulley body have a stepped portion that is thicker than other portions.

  According to the present invention, since the pulley replacement work can be performed only from one side of the pulley device, the pulley can be easily replaced even when the machine room is narrow. In addition, the pulley main body can be replaced without removing the rotary shaft at the time of pulley replacement work, and since the step portion provided on the rotary shaft serves as a reference for positioning the pulley, it is easy to match the direction of the sheave core and the pulley core A pulley device can be provided.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

1 is a cross-sectional view of a pulley device according to a first embodiment. Sectional drawing of the pulley apparatus which concerns on Example 2. FIG. Sectional drawing of the pulley apparatus which concerns on Example 3. FIG. FIG. 6 is a front view of a wedge type collar according to a third embodiment. Sectional drawing of the pulley apparatus which concerns on Example 4. FIG. The perspective view of the elevator apparatus with which the elevator hoist of this invention is applied. The top view of the elevator machine room to which the hoisting machine for elevators of this invention is applied. Cross core adjustment concept of sheave core and pulley core Sectional drawing of the conventional pulley apparatus.

  Examples 1 to 4 of the present invention will be described below with reference to FIGS.

  Hereinafter, the pulley apparatus 1 of Example 1 of this invention is demonstrated along FIG. In addition, duplication description is abbreviate | omitted about the common point with the conventional structure demonstrated in FIGS.

  FIG. 1 is a vertical sectional view of the pulley device 1 of the first embodiment. The features of this embodiment shown in FIG. 1 will be described in comparison with FIG. 9 showing the conventional configuration.

  The conventional rotary shaft 3 shown in FIG. 9 has a configuration in which the key plate 7 is fitted in the key grooves at both ends to be fixed to both the brackets 5a and 5b. However, the rotation of the present embodiment shown in FIG. The shaft 3 is fixed to the bracket 5b by inserting the key plate 7 into the key groove at one end and fixed to the bracket 5a by holding the washer 11 inserted into the screw portion 3c at the other end and fastening the nut 6 did. In place of the screw portion 3c at the other end of the rotary shaft 3, a bolt mounting hole may be provided on the central axis, and the bracket 5a may be fastened by a bolt inserted here.

  Further, in the conventional configuration shown in FIG. 9, the pair of bearings 2 and the pulley body 1 a into which they are press-fitted are positioned by the stepped portion 3 a in the axial center of the rotating shaft 3 and the pair of bearing holders 31. However, in the configuration of this embodiment shown in FIG. 1, the stepped portion 1b having a narrow inner diameter provided at the central portion in the axial direction of the inner peripheral surface of the pulley main body 1a and the thick diameter provided at one end side of the rotating shaft 3 are used. Even if the step 3a is not provided at the center of the rotary shaft 3, the pair of bearings 2 and the pulley main body 1a into which they are press-fitted are provided by the substantially circular collar 4 inserted on the other end side of the step 3b and the rotary shaft 3. It was possible to position it.

  That is, in the configuration of FIG. 9, the step portion 3 a of the rotating shaft 3 is provided between the pair of bearings 2, and the respective bearings 2 are sandwiched between the step portion 3 a and the bearing retainer 31. The rotating shaft 3 can not be separated from the bearing 2 without removing the bearing retainer 31. On the other hand, in the configuration of FIG. 1, there is no portion where the outer diameter of the rotating shaft 3 is larger than the inner diameter of the bearing 2 between the pair of bearings 2. The rotating shaft 3 can be easily separated.

  In FIG. 1, the stepped portion 1b is provided on the inner peripheral surface of the pulley main body 1a, but instead, wide bearings 2 having the same combined width as the width of the pulley main body 1a are juxtaposed The pair of bearings 2 may be positioned by sandwiching these between the step 3 b of the rotating shaft 3 and the collar 4. Also in this case, there is no part where the outer diameter of the rotating shaft 3 is larger than the inner diameter of the bearing 2 between the pair of bearings 2, so if there is no restraint by other parts It can be separated.

  Due to the difference in configuration, the conventional configuration in FIG. 9 and the configuration in the present embodiment in FIG. 1 have the following differences when the pulley body 1a is replaced.

  First, in FIG. 9, since the pulley body 1a integrated with the rotating shaft 3 can be removed only after the key plates 7 on both the bracket 5a side and the bracket 5b side are removed, the pulley device as shown in FIG. When 1 is installed near the wall of the machine room 100 and the space on one bracket side is narrow, it is difficult to remove and attach the pulley body 1a. On the other hand, in FIG. 1, if the nut 6 and the washer 11 on the bracket 5 a side are removed, the pulley body 1 a can be removed without removing the key plate 7 on the bracket 5 b side. Even when installed at the wall, the pulley body 1a can be easily removed.

  Moreover, in FIG. 9, since it is necessary to remove the rotating shaft 3 with the pulley main body 1a, it is necessary to adjust the direction of the rotating shaft 3 again after replacing the pulley main body 1a. On the other hand, in FIG. 1, since the pulley main body 1a and the rotating shaft 3 are separated, the pulley main body 1a can be removed while the rotating shaft 3 remains in the bracket 5b. Therefore, if the direction of the rotary shaft 3 is originally appropriate, it is not necessary to readjust the direction of the rotary shaft 3 after the pulley body 1a is replaced.

  Furthermore, in FIG. 9, although it is possible to adjust the direction of the pulley core by adjusting the fastening amount of each of the bearing pressing and fixing bolts 32 provided on both sides of the pulley main body 1a, in the state where the pulley main body 1a is attached It is difficult to adjust the bearing retainer fixing bolt 32 covered with the brackets 5a and 5b, and fine adjustment in the pulley core direction is difficult. On the other hand, in FIG. 1, the surface that contacts the pulley body 1 a of the step portion 3 b of the rotating shaft 3 serves as a reference surface that determines the direction of the pulley core, so that the nut 6 is appropriately fastened and the collar 4 is connected to the pulley body. The direction of the pulley core after replacement can be easily adjusted in the same direction as that before replacement only by appropriately pressing 1a onto the step 3b.

  The characteristics of the present embodiment described above can be summarized as follows.

  First, when the pulley main body 1a is replaced, the key plate 7 fitted in the key groove of the rotary shaft 3 serves as a rotation stop, so that the nut 6 can be removed simply by turning it with a spanner. Moreover, the pulley main body 1a can be removed without removing the rotating shaft 3 by removing the collar 9 by removing the beam 9a and the bracket 5a.

  Second, since the pulley main body 1a can be attached without removing the rotary shaft 3 at the time of replacement of the pulley main body 1a, the rotary shaft 3 can maintain an appropriate arrangement, and the rotary main body 1a can be rotated even after replacement. The step 3a of the shaft 3 serves as a reference for positioning of the pulley in the axial direction, and the direction of the pulley core is also uniquely determined by the direction of the step 3b. Therefore, the pulley body 1a can be replaced while maintaining the positional relationship between the sheave core and the pulley core before replacement.

  In the above example, the pulley device in the elevator device in the machine room is used. However, the present structure may be used for the pulley device in the hoistway. For example, since a turning pulley in a machine room-less elevator is often installed near the wall of a hoistway, replacement work is facilitated by using a pulley device that can work from the opposite wall side. Furthermore, the hoisting machine of the present invention can be applied to an elevator apparatus other than the elevator apparatus shown in FIG. For example, the roping method may be 2: 1 roping instead of 1: 1.

  A second embodiment of the present invention will be described below with reference to FIG. The same points as the above-described configuration will not be repeatedly described.

  FIG. 2 is a vertical sectional view of the pulley device 1 of the second embodiment. In the first embodiment, a key groove is provided at one end of the rotary shaft 3 and a screw portion 3c is provided at the other end. However, in this embodiment, a key groove is provided at both ends of the rotary shaft 3, and the screw portion 3c is omitted.

  In the first embodiment, the position of the collar 4 in the axial direction is adjusted by adjusting the fastening amount of the nut 6. However, in this embodiment, a screw hole penetrating in the radial direction is provided in the collar 4. By tightening the set screw 20 inserted into the rotary shaft 3, the axial position of the collar 4 is fixed with respect to the rotary shaft 3, and the pair of bearings 2 are sandwiched between the step 3b and the collar 4 of the rotary shaft 3 so that the pulley body 1a The axial position was fixed.

  In the configuration of the present embodiment described above, by removing the key plate 7 on the bracket 5 a side and the set screw 20 of the collar 4, the pulley main body 1 a can be removed without removing the key plate 7 on the bracket 5 b side. Therefore, even when the pulley apparatus 1 is installed near the wall of the machine room 100, the pulley main body 1a can be easily removed as in the first embodiment, and the core direction of the pulley main body 1a can be easily changed. It can be readjusted.

  Also, in general, since the life of the bearing 2 is shortened when an axial load is applied, the axial load is applied to the bearing 2 as compared with the first embodiment in which the axial load is applied to the bearing 2 by fastening the nut 6. In this embodiment, which is not unusual, the effect of prolonging the life of the bearing 2 can also be obtained.

  Embodiment 3 of the present invention will be described below with reference to FIGS. The same points as the above-described configuration will not be repeatedly described.

  FIG. 3 is a vertical cross-sectional view of the pulley device 1 of the third embodiment, and FIG. 4 is a front view of a cage collar used in the present embodiment. In the first and second embodiments, the substantially circular tubular collar 4 whose entire circumference is connected is used, but in the present embodiment, the collar type collar 21 in which a part of the circular pipe is divided is used. As shown in FIG. 4, this collar type collar 21 has a slit 21a lacking only the inner peripheral side, and a slit 21b extending over the entire area in the radial direction, and further bolting fixed in the circumferential direction across the slit 21b. It has a hole 21c and a bolt through hole 21d. Then, by fastening the wedge bolt 22 inserted into the bolt fixing hole 21c and the bolt through hole 21d, the inner diameter of the wedge collar 21 is reduced, and the wedge collar 21 can be fixed to the rotary shaft 3. .

  According to the present embodiment, the following effects can be obtained in addition to the effects of the second embodiment. That is, the inner circumferential surface of the collar 21 is in contact with the outer periphery of the rotary shaft 3 by tightening the bolt 22 and a strong load is generated in the inner peripheral direction of the shaft by the tightening force of the bolt 22. As compared with the second embodiment, the axial direction holding force becomes stronger in the collar type collar 21 and the rotary shaft 3. Therefore, the pulley apparatus 1 can be held in the axial direction even in an elevator in which a strong load is applied to the pulley apparatus 1 from the main rope 107 in the axial direction.

  Hereinafter, Example 4 of the present invention will be described with reference to FIG. The same points as the above-described configuration will not be repeatedly described.

  FIG. 5 is a vertical sectional view of the pulley device 1 of the fourth embodiment.

  In the first embodiment, the nut 6 inserted into the screw portion 3c of the rotating shaft 3 is fastened to fix the axial position of the pulley body 1a. In the second embodiment, the set screw 20 that penetrates the collar 4 in the radial direction is fastened. Then, the axial position of the pulley body 1a was fixed. In Example 3, the wedge bolt 22 penetrating the wedge collar 21 in the circumferential direction was fastened to fix the axial position of the pulley body 1a.

  On the other hand, in the present embodiment, a plurality of bolt fixing holes are provided in the portion of the bracket 5a facing the collar 4, and a plurality of jack bolts 23 inserted into the bolt fixing holes are fastened, whereby the collar 4 is connected to the pulley body 1a. The axial position of the pulley body 1a is fixed by sandwiching the pair of bearings 2 pressed against the pulley body 1a between the step 3b and the collar 4.

  This example is common to Example 1 in that the collar 4 is pressed against the pulley body 1a to fix the position of the pulley body 1a in the axial direction, but compared to Example 1 that uses only one thick screw portion 3c, The configuration is different in that a plurality of thin jack bolts 23 are used.

  In the configuration of the first embodiment shown in FIG. 1, when a radial load is applied to the pulley main body 1a, a bending stress is applied to the screw portion 3c. Therefore, it is necessary to thicken the screw portion 3c in proportion to the magnitude of the radial load. On the other hand, in the configuration of this embodiment shown in FIG. 5, since the axial force acts on the jack bolt 23 that generates the axial force for fixing the pulley body 1a, not the bending stress, the radial stress applied to the pulley body 1a. It is not necessary to make the jack bolt 23 thick even if the Moreover, since the several jack bolt 23 can be provided in the bracket 5a, the load concerning each can be made smaller by increasing the number of the jack bolts 23 to be used.

  Generally, when the bolt is thin, the strength of the bolt is weakened, and when the fastening force is lowered, the possibility of breakage of the bolt is further increased. Therefore, in the configuration of the embodiment using a thin bolt for fixing the collar 4 Compared to the configuration of the first embodiment, it is necessary to further suppress the loosening of the bolt. For this reason, in the present embodiment, by using the jack bolt 23 with less loosening than a normal bolt, it is possible to suppress the loosening of the bolt and to avoid the breakage of the bolt.

  As described above, in this embodiment, in addition to the effects of the above-described embodiment, even when a large radial load is applied to the pulley body 1a, the shaft strength can be easily increased by increasing the number of jack bolts 23. can do.

1 Pulley device,
1a Pulley body,
Step 1b,
2 bearings,
3 rotation axes,
3a, 3b steps,
3c screw,
4 colors,
5a, 5b bracket,
6 nuts,
7 key board,
8 key plate fixing bolt,
9a, 9b Beams,
10a, 10b Bracket fastening bolt,
11 washers,
20 setscrews,
21 楔 color,
21a, 21b slits,
21c bolt fixing hole,
21d bolt through hole,
22 anchor bolts,
23 jack bolts,
31 bearing retainer,
32 bearing retainer fixing bolt 100 machine room,
100a entrance,
101 hoistways,
102 Balance weight side guide rails,
103 cage side guide rails,
104 baskets,
105 Balance Weight,
106 machines,
106a sieve,
107 main cable,
108 governors,
109 Control panel

Claims (11)

A pulley device that is installed between two beams and has a pulley core arranged so that its direction coincides with the sheave core of the hoisting machine,
A first bracket attached to one of the beams,
A second bracket attached to the other beam,
A rotating shaft installed between the two brackets,
A pulley body rotatably supported by the rotating shaft via a bearing,
The first bracket holds one end of the rotating shaft so as not to rotate,
The second bracket holds the other end of the rotating shaft detachably,
The rotating shaft has a step portion thicker than other portions between the first bracket and the pulley body. In the pulley apparatus according to claim 1,
The pulley apparatus according to claim 1, wherein a substantially circular collar is inserted between the pulley body and the second bracket. In the pulley apparatus according to claim 1,
The pulley device, wherein the rotation shaft is fixed to the first bracket so as not to rotate by fitting a key plate into a key groove provided at one end of the rotation shaft. In the pulley apparatus according to claim 2,
A pulley apparatus, wherein a nut is fastened to a screw portion provided at the other end of the rotating shaft to adjust a fixing position of the collar in the rotating shaft direction. In the pulley apparatus according to claim 2,
A pulley apparatus, wherein a fixing screw passing through the collar in a radial direction is fastened to adjust a fixed position of the collar in a rotation axis direction. In the pulley apparatus according to claim 2,
The said collar has a slit in radial direction, the bolt which penetrates this slit in the circumferential direction is fastened, and the fixed position of the rotating shaft direction of the said collar is adjusted, The pulley apparatus characterized by the above-mentioned. In the pulley apparatus according to claim 2,
A pulley device is characterized in that a jack bolt penetrates the second bracket at a position facing the collar, and the jack bolt is fastened to adjust a fixed position of the collar in the rotation axis direction. . Pulley body,
Two bearings press fitted coaxially into the pulley body;
A rotating shaft that supports the pulley body via the bearing;
A substantially circular tubular collar inserted into the rotating shaft;
A pulley apparatus comprising a pair of left and right brackets into which the rotating shaft is inserted,
The pulley body has a step at the axially central portion of the inner peripheral surface,
One end of the rotating shaft has a key groove for attaching a key plate, and a step portion that contacts the bearing outside the axial width of the pulley body, and the other end of the rotating shaft has a screw Have a department,
The pulley apparatus, wherein the pulley main body is fixed by being sandwiched between the stepped portion and the collar by fastening a nut to the screw portion. A method of replacing a pulley body of a pulley device, which is installed between two beams and has a pulley core arranged so that the direction coincides with a sheave core of a hoisting machine,
The pulley device is
A first bracket attached to one of the beams,
A second bracket attached to the other beam,
A rotating shaft installed between the two brackets,
A pulley body rotatably supported by the rotating shaft via a bearing;
A generally tubular collar inserted into the rotating shaft;
Equipped with
After removing the bracket and beam on one end side of the rotating shaft,
A method of replacing a pulley main body, wherein the collar inserted into the rotary shaft and the pulley main body are removed while the rotary shaft is attached to a bracket on the other end side of the rotary shaft. In the pulley body replacement method according to claim 9,
A threaded portion is provided on one end side of the rotating shaft,
A method of replacing a pulley main body, comprising: removing a nut attached to the screw portion before removing a bracket and a beam on one end side of the rotating shaft. The pulley main body replacement method according to claim 9,
A keyway is provided on one end side of the rotating shaft,
A method of replacing a pulley main body, comprising: removing a key plate attached to the key groove before removing a bracket and a beam on one end side of the rotating shaft.

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